Post-Jam Update: Saving and Ending

Hi everyone! This update finally adds saving and a feature that didn't make into last year's build.

Changelog (new content spoilers below)

- Saving: the game wasn't designed around this, so the implementation is a little rough! Your progress will autosave, indicated in the top-left by a white icon if successful.

- Offline progress: has been tracked but greatly limited, since this incremental is an active one - there's a way around every time wall! (Though you can of course idle to your heart's content, and that's fine too!)

- The 4th Buyable: a new item available after reaching significant speed. They are obtained by sacrificing your cables, and they don't reset when you hit the ground.

- Fixes and lots of polishing.

- The End: has been set at the speed of light. You'll know when you're there.

Hope you enjoy!

- Kevin